diff --git a/homeassistant/helpers/config_validation.py b/homeassistant/helpers/config_validation.py
index 6dd5d7f2bdb..f7245607be7 100644
--- a/homeassistant/helpers/config_validation.py
+++ b/homeassistant/helpers/config_validation.py
@@ -1350,7 +1350,8 @@ SERVICE_SCHEMA = vol.All(
 )
 
 NUMERIC_STATE_THRESHOLD_SCHEMA = vol.Any(
-    vol.Coerce(float), vol.All(str, entity_domain(["input_number", "number", "sensor"]))
+    vol.Coerce(float),
+    vol.All(str, entity_domain(["input_number", "number", "sensor", "zone"])),
 )
 
 CONDITION_BASE_SCHEMA = {